Your boiler's internal sensor is struggling to accurately read the water pressure, which prevents the system from operating safely.

System pressure sensor fault

What causes this fault?

This fault occurs when the electronic sensor responsible for monitoring the water level inside the boiler fails or provides an illogical reading. The most common reason is that the sensor's internal diaphragm has become blocked with system sludge or the electrical connections have corroded over time. Because the boiler cannot confirm there is enough water to operate safely, it shuts down to prevent internal overheating.